Chirp Pong 🔗
<p><strong>Tool:</strong> <a href="https://tools.simonwillison.net/chirp-pong">Chirp Pong</a></p> <p>Another game experiment - I [...]
Simon Willison's Weblog
Posts
Anthropic tells investors quarterly revenue up nearly 50% to $16.8bn ahead of IPO 🔗
<p><strong><a href="https://www.ft.com/content/11632d03-358c-454b-af95-d06d4072932b?syn-25a6b1a6=1">Anthropic tells investors quarterly revenue [...]
Tree Appreciator 🔗
<p><strong>Tool:</strong> <a href="https://tools.simonwillison.net/tree-appreciator">Tree Appreciator</a></p> <p>Another game ex [...]
AI is mass decompiling games. That's both awesome and scary. 🔗
<p><strong><a href="https://popcar.bearblog.dev/ai-is-mass-decompiling-games-thats-both-awesome-and-scary/">AI is mass decompiling games. That&# [...]
Redesigning source control at Anthropic 🔗
<p><strong><a href="https://www.anthropic.com/engineering/redesigning-source-control">Redesigning source control at Anthropic</a></strong></p> I [...]
llm-gemini 0.35 🔗
<p><strong>Release:</strong> <a href="https://github.com/simonw/llm-gemini/releases/tag/0.35">llm-gemini 0.35</a></p> <p>I added [...]
Quoting Geoffrey Huntley 🔗
<blockquote cite="https://ghuntley.com/agency/"><p>If the agent isn't using my diagnostics library, I could introspect and update AGENTS.md, but [...]
web-edit 0.1a1 🔗
<p><strong>Release:</strong> <a href="https://github.com/simonw/web-edit/releases/tag/0.1a1">web-edit 0.1a1</a></p> <p>Includes [...]
llm-meta-ai 0.2 🔗
<p><strong>Release:</strong> <a href="https://github.com/simonw/llm-meta-ai/releases/tag/0.2">llm-meta-ai 0.2</a></p> <p>Meta AI [...]
Hello Python 3.15, goodbye 3.10, and now I can use 3.11 🔗
<p>Python 3.15 <a href="https://www.python.org/downloads/release/python-3150/">is here</a>! Here's the essential <a href="https://docs.python.org [...]
Profiling web-edit with Python 3.15: flame graphs and source heatmaps 🔗
<p><strong>Research:</strong> <a href="https://github.com/simonw/research/tree/main/python-3-15-web-edit-profiling#readme">Profiling web [...]
web-edit 0.1a0 🔗
<p><strong>Release:</strong> <a href="https://github.com/simonw/web-edit/releases/tag/0.1a0">web-edit 0.1a0</a></p> <p>I was wor [...]
datasette-ports 0.4 🔗
<p><strong>Release:</strong> <a href="https://github.com/datasette/datasette-ports/releases/tag/0.4">datasette-ports 0.4</a></p> [...]
Dwarf Fortress uses version control now 🔗
<p>I remember hearing a while ago that Dwarf Fortress didn't use version control. That fact has been lodged in my head, because given its inheren [...]
Python 3.15.0 added to actions/python-versions 🔗
<p><strong><a href="https://github.com/actions/python-versions/commit/49858b91c92d27403416ee43117032e91d00ce24">Python 3.15.0 added to actions/p [...]
Quoting The New York Times 🔗
<blockquote cite="https://www.nytimes.com/2026/10/09/technology/anthropic-rogue-ai-agents.html"><p>Anthropic detailed the activity of its A.I. ag [...]
Deno is joining Cloudflare 🔗
<p><strong><a href="https://deno.com/blog/cloudflare">Deno is joining Cloudflare</a></strong></p> The Deno team released the first version of <a [...]
Quoting Matthew Green 🔗
<blockquote cite="https://twitter.com/matthew_d_green/status/2108552414978564418"><p>Everyone is very concerned about being respectable, so I’m g [...]
A new feature for my blog, built using my voice 🔗
<p>I shipped a new feature for my blog today: the <a href="https://simonwillison.net/newsletters/">Newsletters</a> page, which offers an index of [...]
ttok 1.0 🔗
<p><strong>Release:</strong> <a href="https://github.com/simonw/ttok/releases/tag/1.0">ttok 1.0</a></p> <p>I released <a href="h [...]
ttok 0.4 🔗
<p><strong>Release:</strong> <a href="https://github.com/simonw/ttok/releases/tag/0.4">ttok 0.4</a></p> <p><code>ttok</code> is [...]
Quoting Carson Gross 🔗
<blockquote cite="https://htmx.org/essays/yes-and/"><p>Computer programming is, fundamentally, about two things:</p> <ul> <li>Problem-solving usi [...]
Quoting Ben Affleck 🔗
<blockquote cite="https://www.youtube.com/watch?v=HzraLR2VkNM&t=2259s"><p>I've always been kind of into computers since I was young. And then [...]
Claude Haiku 5.5 🔗
<p>As previously <a href="https://simonwillison.net/2026/Sep/28/claude-sonnet-5-5/">promised</a>, here's Anthropic's new fast, low cost model: <a [...]
Anti-Patterns in Software Blogging 🔗
<p><strong><a href="https://refactoringenglish.com/blog/anti-patterns-software-blogging/#summary">Anti-Patterns in Software Blogging</a></strong [...]
Quoting Jake Boggan 🔗
<blockquote cite="https://news.ycombinator.com/item?id=49984923#49987367"><p>I was a graph theory junkie long ago and even moved to Budapest for [...]
OpenAI “rogue” agent activities found on Wikimedia projects 🔗
<p><strong><a href="https://wikimediafoundation.org/news/2026/10/05/openai-rogue-agent-activities-found-on-wikimedia-projects/">OpenAI “rogue” a [...]
Quoting Victoria Kim 🔗
<blockquote cite="https://www.nytimes.com/live/2026/10/05/world/openai-australia-hearing/94c8067e-4098-5c00-9673-c78cb58a9d8a"><p>Since the Medic [...]
llm-openai-decisions 0.1a0 🔗
<p><strong>Release:</strong> <a href="https://github.com/simonw/llm-openai-decisions/releases/tag/0.1a0">llm-openai-decisions 0.1a0</a>< [...]
llm-mistral 0.16 🔗
<p><strong>Release:</strong> <a href="https://github.com/simonw/llm-mistral/releases/tag/0.16">llm-mistral 0.16</a></p> <p>Adds [...]